Nature of Operations and Summary of Significant Accounting Policies - Schedule of Changes in Accrual for Warranty and Related Costs (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Product Warranty Liability [Abstract]
Balance, beginning of year	$ 244,000	$ 291,000
Warranties issued	523,000	110,000
Warranties settled	(401,000)	(157,000)
Balance, end of year	$ 366,000	$ 244,000